Method of producing designs and article for use therein



C. MAIER ET AL METHOD OF PRODUCING DESIGNS AND ARTICLE FOR USE THEREINFiled Aug. 18, 1928 E E m W5 w "T A P w 0 A W W .J% m M u 5 as Ms D @DMm A 1. A R E E O E L L 5 L m A H R 000 0'00 0'00 0000 J 0000 0000 Oct.14, 1930.

Patented Oct. l'4, 1930 UNITED STA CARL IAIEB AND WILLIAM SWAYSLAND, OFCLEVELAND, OHIO IETKOD OI PBOIDUCIN G DESIGNS AND ARTICLE FOR USETEEBEIN Application filed August 18, 1928. Serial No. 300,612.

The present invention relates, as indicated,

to a method of producing designs and article for use therein. Moreparticularly the invention relates to a method of forming de signs onpaper, cloth, or other surfaces by means of treating, with a eagent,chemicals on such surfaces to change the color of such chemicals wherebythe same are rendered visible on the surface.

The primary object of the invention is to provide a novel means ofproducing designs which shall have the appearance of halftones and whichshall be adapted to be photographed; and a method whereby such designsmay be removed from the surface and replaced by the same or otherdesigns in substantially the same manner. A further object of theinvention is to provide an article the surface of which is adapted totake a part in the method above described. Further objects of theinvention will appear as the description proceeds. v

Fig. 1 is a plan view taken from above of a sheet of paper impregnatedwith dots of lead sulphate; Fig. 2 is a view similar to Fig. 1 showingthe reaction of a sulphide upon the dots of Fig. 1; Fig. 3 is a viewsimilar to the preceding figures showing the reaction of hydrogenperoxide upon the dots of Flg. 2; 80 and Fig. 4 is another view showingthe reaction of said dots when treated with the sulphide.

While it is to be understood that the meth- 0d of our invention may beused on practically any substantiall white surface, the same will bedescribed with respect to white paper. We prefer a sheet of paper forthe carrying out of said method in the following manner. A sheet or rollof paper is inserted in any well known type of printing press and amultiplicity of closely spaced tiny dots are printed on the paper withan ink including a SOlld either in suspension or in solution, such solidbeing invisible on the surface of the paper. A suitable ink for thispurpose may be compounded of glycerine and lead acetate, thickened withlead carbonate to the desired consistency for printing. If the ink thusdescribed is used, the print is allowed to dry and is thereafter brushedwith art gum or some other suitable substance to remove the excess leadcarbonate on the surface and to leave a smooth drawing surface.

Thereafter the print carrying the multilicity of dots of lead acetate iswashed with sulphuric acid solution. Preferably, such solution is of thestrength of approximately two parts of 98% of sulphuric acid and 23 artsof water. Thisoperatlon causes the sulphuric acid to react with the leadacetate to form insoluble lead sulphate. Of course it is to beunderstood that the lead sulphate takes the place of the lead acetateboth figuratively and literally,

whereat'ter, as will be obvious, the paper or other surface isimpregated with a multiplicity of tiny spots of lead sulphate.

as will be obvious,

The tiny spots of white lead sulphate will,

be substantially if not entirely invisible upon the white surface of theaper. The paper is now washed with water to prevent smearing of theprint, and after the print is dried the same is ready for use by anartist or draftsman.

The artist or draftsman may, of course, use

phide.

As the artist carefully works upon the surface of the paper, it will beseen that e will individually treat individual spots of v lead sulphatewith the sulphide solution, thus individually transforming the leadsulphate of individual spots to lead sulpnite.

In case the artist mistake and draws or paints a line where no line isdesired, he may dip a second brush or pen into a solution of hydrogenperoxide and draw or-paint with such solution over such spots of leadsulphide as he does not wish to e visible. The hydrogen peroxide willrect with the lead sulphide of such spots to transform the lead sulphidethereof to white lead sulphate, thus removing from the surface, so faras visibility isconcerned, the unesired line or lines.

After the design has been completed and as been photographed forreproduction, the

or draftsma makes a print may be dipped in or washed witha soluv I tionof hydrogen eroxide, whereby all of the spots of lead sulp ide will bechanged a am to lead sulphate, and after the sheet has en dried the sameis ready again to be treatedby the artist or draftsman for theprbductionof a new design. I

If a yellow print rather than a black one is desired, a solution of'achromate salt isused in place of the sul hide solutlon, and treatment ofthe lead su phate spots with such salt solution will cause a changethereof to yellow lead chromate. lighter shade than that produced bylead sulphide is desired, the blank sheet may prcgnated with amultiplicity of spots by printing with a mixture of glycerine and tannicacid instead of with the ink above described. In case this tannic acidink is used, the artist works with aisolution ofa ferric salt to develothe print or design, and such design may. e eradicated by washing ortreating with oxalic acid.

One of the major advantages of the present invention lies in the factthat the prepared sheets may be used over and overvagain withoutmaterially damaging the surface thereof and without a material amountof'labor. The labor involved in erasing even a pencil drawing of anyappreciable size istoo great to permit the reuse of even rather valuablesheets of paper or cloth or other drawing material The sheets ofvthepresent invention, on the other hand, may be reprepared for use merelyby dipping the same in theeradicator solution and ermitting them to dry.

Other orms may be employed embodying the features of our inventioninstead of the one here explained, change being made in the form orconstruction, provided the elements stated by any of the followingclaims or the equivalent of such stated elements be employed, whetherproduced by our preferred method or by others embodying steps equivalentto those stated in the following claim.

We therefore particularly point out anddistinctly claim as ourinvention:

In a method of forming a visible design on white paper, the steps whichconsist in impregnating a surface of such paper with a multiplicity oftiny spots of lead sulphate, individually treating certain of-said spotswith a solution of a soluble sulphide whereby the lead sulphatecomprising such treated spots I is changed to lead sulphide,individually treating certain of said lead sulphide spots with h drogenperoxide to change the lead sulphi e to lead sulphate, and individuallytreating certain of said last-mentioned spots with such sulphidesolution whereby the lead sulplhate thereof is again changed toleadsulphl e.

igned by us this 15th day of August, 1928. CARL MAIER.

' WM. SWAYSLAND.

In case a blankprint of a" be im-

